WO2024098473A1 - Procédé et appareil de reconstruction fine pour structure de sédiment de canal - Google Patents

Procédé et appareil de reconstruction fine pour structure de sédiment de canal Download PDF

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Publication number
WO2024098473A1
WO2024098473A1 PCT/CN2022/134521 CN2022134521W WO2024098473A1 WO 2024098473 A1 WO2024098473 A1 WO 2024098473A1 CN 2022134521 W CN2022134521 W CN 2022134521W WO 2024098473 A1 WO2024098473 A1 WO 2024098473A1
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WO
WIPO (PCT)
Prior art keywords
tank
sediment
frozen
cti
freezing
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PCT/CN2022/134521
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English (en)
Chinese (zh)
Inventor
唐明明
韩迪
马慧芳
孔令沂
钱思源
张茜
熊思琛
黄伯阳
张炎
韩仔坤
解容
彭晨阳
程佳俊
洪瑞峰
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中国石油大学(华东)
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Application filed by 中国石油大学(华东) filed Critical 中国石油大学(华东)
Publication of WO2024098473A1 publication Critical patent/WO2024098473A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/42—Low-temperature sample treatment, e.g. cryofixation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/04—Investigating sedimentation of particle suspensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]

Definitions

  • the invention relates to the technical field of a method for finely reconstructing a water tank sediment structure.
  • drilling and logging data can only extract geological information within a very small range of about 1-3m around the borehole and the borehole.
  • the well spacing is generally greater than 100m, there is great uncertainty in the reservoir characteristics between wells, which is difficult to obtain through drilling or logging data, and further sedimentation model analysis is required.
  • Sedimentation flume experiment is a method of conducting sedimentation experiments in experimental flumes using water media and artificial ore body models to obtain or verify theoretical curves and process field data.
  • the sedimentary structure of macroscopic large-scale sedimentary bodies can be studied, and a sedimentary model that can be applied to large-scale reservoir prediction can be constructed to serve oil field exploration and development.
  • the sedimentary structure refers to the overall characteristics of the spatial distribution and arrangement of the components of sedimentary rocks, or that is, the sum of the relationships between the particles that make up the rock, which is the primary structure formed during or after sediment deposition and before consolidation, including bedding and layer structures.
  • the process of obtaining the overall three-dimensional model is the fine reconstruction of the flume sedimentary structure.
  • the existing method for fine reconstruction of flume sediment structure is mainly the continuous slicing method, which uses a series of parallel planes to parallel cut the model after the flume experiment is completed and dried, to obtain the internal and contour information of the section, and then uses computer image processing technology as a basis to link the information of each section one by one to obtain a three-dimensional stereo image.
  • the continuous sectioning method has the following disadvantages: (1) High destructiveness: The continuous sectioning method needs to be carried out layer by layer, which will destroy the previous sedimentary structure and make the model unable to be used for other research; (2) Low precision: The continuous sectioning method adopts mechanical cutting method.
  • the cutting accuracy is limited by the cutter, and the mechanical stress generated during the cutting process will destroy part of the sedimentary structure, which will lead to the loss of analysis accuracy; (3) Time-consuming: The continuous cutting method needs to wait for the model to dry before it can be carried out, which is time-consuming; (4) Easy to deform: When the continuous cutting method is carried out layer by layer, the sedimentary body is peeled off and a fresh cutting surface is formed, because the sand body on one side is removed and the stress environment changes, the cutting surface will be deformed, part of the sand body will fall off, and the original sedimentary structure will be destroyed.
  • the purpose of the present invention is to provide a new method and device for fine reconstruction of the sedimentary structure of a water tank, which can significantly improve the accuracy and efficiency of the fine reconstruction of the sedimentary structure of a water tank without causing high destructiveness to the post-experimental model.
  • a device for fine reconstruction of a water tank sediment structure comprising: a combined bottom plate and a combined freezing tank, wherein the combined bottom plate is formed by paving and splicing a plurality of rectangular basic bottom plates of equal thickness, and there is a splicing gap between adjacent basic bottom plates, and the splicing gap is filled with an elastic adhesive, and the filled splicing gap is of the same thickness as the basic bottom plate;
  • the combined freezing tank comprises a plurality of local freezing tanks;
  • the local freezing tank comprises: a rectangular tank body with an open bottom and a hollow interior, and at least two channels located on the top surface of the tank body and connected to the hollow interior thereof, wherein any One channel is for the freezing medium to enter, the other channel is for the freezing medium to flow out after use, and three metal particles with different diameters are located on the top surface of the trough body at different positions from the two channels; wherein, any basic bottom plate has a local freezing trough matched with it, and the local freezing trough satisfies:
  • the channel can be a structure protruding from the top surface of the tank body, such as a pipe extending upward, or a structure recessed into the tank body, such as a pipe extending inward, or an opening on the top without a specific shape.
  • the sizes of the basic bottom plates are the same; correspondingly, in the combined freezing tank, the sizes of the tank bodies of the local freezing tanks are the same.
  • the joint gaps between adjacent base slabs have the same width, and their widths sw satisfy: 0 ⁇ sw ⁇ 2mm.
  • the diameters of the three metal particles with different diameters satisfy: if the diameter of any one of the metal particles is pw, the diameters of the other two metal particles are 2*pw and 4*pw respectively.
  • the elastic coefficient of the elastic adhesive satisfies that when the thickness of the sediment thereon reaches the maximum thickness of the water tank, the elastic deformation of the elastic adhesive is less than 0.0001.
  • the present invention further discloses a method for finely reconstructing a water tank sediment structure using the above device, which comprises:
  • the local freezing tank is used to divide the sediment body located on the combined bottom plate and completed the water tank sedimentation experiment, so as to obtain a plurality of independent sediment bodies located on the basic bottom plate and covered by the tank body of the local freezing tank;
  • the independent sediment body is subjected to a quick freezing treatment by the local freezing tank to obtain a frozen sediment body;
  • the spatial positions of three metal particles on the local freezing groove of the frozen deposit i.e., the third positional relationship, are identified;
  • the three-dimensional sedimentary structure data corresponding to different frozen sedimentary bodies are spliced to obtain a three-dimensional flume experimental sedimentary structure.
  • CT scanning is computer tomography imaging technology, which uses precisely collimated X-rays and extremely sensitive detectors to perform continuous tomographic scanning around the object to be measured and form a three-dimensional image; according to the different physical resolutions of imaging, CT scanning methods can be roughly divided into millimeter CT, micrometer CT and nanometer CT, among which the resolution scale of a single pixel of micrometer CT can reach 1-10 micrometers.
  • the CT scan described in the present invention is a micron CT scan.
  • the fine reconstruction method specifically includes:
  • the local freezing tank is used to divide the sediment body located on the combined bottom plate and completed the water tank sedimentation experiment, so as to obtain a plurality of independent sediment bodies located on the basic bottom plate and covered by the tank body of the local freezing tank;
  • a freezing medium is injected through a channel of the local freezing tank to rapidly freeze the post-experimental sediment in the independent sediment to obtain a frozen sediment. All frozen sediments are labeled as follows:
  • Pi_DX, Pi_EX, Pi_FX are the coordinates of the three marking points in the X direction
  • Pi_DY, Pi_EY, Pi_FY are the coordinates of the three marking points in the Y direction
  • Pi_DZ, Pi_EZ, Pi_FZ are the coordinates of the three marking points in the Z direction
  • i 1...N ⁇ ;
  • the i-th frozen deposit body after the marking is placed in a rotating CT scanner, and the frozen deposit body is irradiated once for each rotation of theta angle, and the scanning data Tk under each irradiation is obtained, that is, the slice data under different rotation angles.
  • the scanning data Tk under each irradiation is obtained, that is, the slice data under different rotation angles.
  • a total of 360/theta slice data are obtained, which are sequentially composed into a slice information set ⁇ Tk
  • k 1...360/theta ⁇ ;
  • Jordan transformation is used to obtain the three-dimensional sedimentary structure data CTi of the i-th frozen sediment body
  • the three-dimensional sedimentary structure CTi is spliced to obtain the three-dimensional reconstructed volume data F of the water tank sedimentary structure.
  • the present invention has the following beneficial effects: the method for fine reconstruction of the trough sediment structure of the present invention can combine CT scanning and local freezing, which can significantly improve the accuracy and efficiency of the fine reconstruction of the trough sediment structure without causing excessive destructive damage to the experimental results.
  • FIG. 1 is a schematic diagram of the laying structure of the sink bottom plate involved in a specific implementation manner.
  • FIG. 2 is a schematic diagram of the structure of a local freezing tank involved in a specific implementation manner.
  • FIG3 is a schematic diagram of the process of segmenting and freezing a sediment body by a local freezing tank involved in a specific implementation manner.
  • FIG. 4 is a schematic diagram of a frozen deposit body CT scanning process involved in a specific implementation manner.
  • FIG5 is a schematic diagram of stitching micron CT scanning data in a local cryotank involved in a specific implementation manner.
  • some specific implementations of the method for fine reconstruction of the sink sediment structure include the following steps:
  • Step 1 Referring to FIG. 1, before the sink deposition experiment begins, a number of rectangular sink bottom plates FB (i.e., the aforementioned basic bottom plates) of equal thickness are laid on the rectangular sink base FA of the experimental sink; each sink bottom plate FB only covers a local area of the sink base FA, and after being spliced, covers the entire area of the sink base FA, i.e., the entire base surface of the sink base FA, with equal thickness to form the combined bottom plate; there is a splicing gap FC between each adjacent sink bottom plate FB, and the splicing gap FC is bonded with an elastic adhesive such as soft rubber; a deposition sink experiment is carried out in the sink after the laying is completed.
  • each sink bottom plate FB only covers a local area of the sink base FA, and after being spliced, covers the entire area of the sink base FA, i.e., the entire base surface of the sink base FA, with equal thickness to form the combined bottom plate; there is a splicing gap FC between each
  • the shapes and sizes of the sink bottom plates FB are the same.
  • the shapes and sizes of the joint gaps between adjacent sink bottom plates FB are the same. Further preferably, the width sw of the joint gap satisfies: 0 ⁇ sw ⁇ 2mm.
  • the elastic coefficient of the elastic adhesive satisfies that when the thickness of the deposit thereon reaches the maximum thickness of the water tank, the elastic deformation of the elastic adhesive is less than 0.0001, so as to avoid the elastic adhesive having a substantial influence on the deposition process.
  • Step 2 Before or during the water tank deposition experiment, prepare several local freezing tanks as shown in Figure 2, which include: a rectangular tank body TG with an open bottom and a hollow interior, three channels TA, TB, and TC located on the top surface of the tank body TG and connected to the hollow interior, and three metal particles TD, TE, and TF with different diameters located on the top surface of the tank body TG.
  • any one channel such as channel TA is used for the injection of a freezing medium such as liquid nitrogen, and the other two channels such as channels TB and TC are used for the outflow of the freezing medium after entering the tank body and being used.
  • the three metal particles are used for position marking, which can form clear marking points in the subsequent micron CT scanning image.
  • the tank body TG is made of high-strength plastic.
  • the diameters of the three metal particles are pw, 2*pw, and 4*pw, respectively.
  • the local freezing tank satisfies: the thickness of the tank body TG is sw/2, the length is LL+sw/2, the width is LW+sw/2, and the height is LH, and the height LH needs to be higher than the maximum thickness of the sediment in the tank, wherein sw represents the width of the aforementioned joint gap, LL represents the length of the aforementioned tank bottom plate FB, and LW represents the width of the aforementioned tank bottom plate FB.
  • Step three Referring to Figure 3, after the sedimentation tank experiment is completed, it is not necessary to dry it. While keeping the sediment in the tank moist, place the local freezing tank on the tank bottom plate FB loaded with the post-experiment sediment body S, and align one side of the local freezing tank with the edge of the tank bottom plate FB. Then press the local freezing tank to slowly cut down until the tank bottom plate FB loaded with the post-experiment sediment body S that fills the bottom surface of the local freezing tank is completely cut out to obtain an independent sediment body. A freezing medium such as liquid nitrogen is injected through a channel of the local freezing tank to quickly freeze the post-experiment sediment body in the independent sediment body to obtain a frozen sediment body, thereby maintaining the sediment structure characteristics and maintaining its morphological stability.
  • a freezing medium such as liquid nitrogen is injected through a channel of the local freezing tank to quickly freeze the post-experiment sediment body in the independent sediment body to obtain a frozen sediment body, thereby maintaining the sediment structure characteristics and maintaining its morphological stability.
  • each local freezing tank corresponds to a frozen sediment
  • all frozen sediments are labeled as follows:
  • Pi_DX, Pi_EX, Pi_FX are the coordinates of the three marking points in the X direction
  • Pi_DY, Pi_EY, Pi_FY are the coordinates of the three marking points in the Y direction
  • Pi_DZ, Pi_EZ, Pi_FZ are the coordinates of the three marking points in the Z direction
  • i 1...N ⁇ .
  • step three further includes: transferring each frozen sediment body to a flat plate of equal thickness according to its arrangement relationship on the water tank bottom plate FB, and then performing the marking process.
  • Step 4 Referring to FIG. 4 , a CT imaging system composed of CTA: radiation source, CTB: turntable, CTC: imaging plate, CTD: computer, etc. is used to perform a rotational CT scan on the frozen sediment body T after the annotation process at a rotation angle of 0-360° to obtain CT scan data at different rotation angles. Based on the CT scan data at different rotation angles, a Jordan transformation is used to obtain the three-dimensional sedimentary structure data CTi of the frozen sediment body.
  • step four may include:
  • the frozen deposit is irradiated once, and the scan data Tk obtained by each irradiation, i.e., the slice data at the corresponding rotation angle, is stored in a data processor such as a scanning computer;
  • Jordan transformation is used to obtain the three-dimensional sedimentary structure data CTi of the i-th frozen sediment body
  • the process of steps one to six is used to finely reconstruct the sink deposition structure, wherein the sink base is a square with a side length of 200.18 cm, the sink bottom plate FB laid thereon is a square with a side length of 20 cm, and the width of the filling seam embedded between the sink bottom plates FB is 2 mm.
  • the sink experiment was carried out for 12 hours, and the thickest deposit formed was 2 cm. After the experiment is completed, the deposit is cut using a square local freezing tank, the side length of the local freezing tank is 20 cm, the shell thickness is 1 mm, and the height is 6 cm.
  • the diameter of the metal particles at the marked point TD on the local freezing tank is 0.5 mm
  • the diameter of the metal particles at the TE point is 1.0 mm
  • the diameter of the metal particles at the TF point is 2.0 mm.
  • the coordinate information of all the marking points of the local freezing tanks was recorded using a laser locator. After that, micrometer CT scanning and data splicing were performed on each local freezing tank, and finally a three-dimensional reconstruction model of the sediment with an accuracy of 10 ⁇ m was synthesized. See Figure 5 for an example of images before and after splicing. At the same time, the frozen sediments in each local freezing tank were placed in an incubator for continued use next time.

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Abstract

L'invention concerne un procédé et un appareil de reconstruction fine pour une structure de sédiment de canal. L'appareil comprend plusieurs chambres de congélation locales. Chaque chambre de congélation locale comprend : un corps de chambre de forme cuboïde ayant une face inférieure ouverte et un intérieur creux ; au moins deux canaux, qui sont situés sur la face supérieure du corps de chambre et en communication avec son intérieur creux, l'un quelconque des canaux permettant l'entrée d'un milieu de congélation, et l'autre canal permettant la sortie du milieu de congélation après son utilisation ; et trois particules métalliques situées sur la face supérieure du corps de chambre à des positions différentes des deux canaux, et dont les diamètres sont différents. Le procédé et l'appareil de reconstruction fine peuvent améliorer significativement la précision et l'efficacité de la reconstruction fine d'une structure de dépôt de canal sans avoir d'impact hautement destructif sur des résultats d'expérience.
PCT/CN2022/134521 2022-11-11 2022-11-26 Procédé et appareil de reconstruction fine pour structure de sédiment de canal WO2024098473A1 (fr)

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CN202211414437.0A CN115901558A (zh) 2022-11-11 2022-11-11 水槽沉积结构精细重构方法及装置
CN202211414437.0 2022-11-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118603254A (zh) * 2024-08-08 2024-09-06 同济大学 一种隧道内积水非接触识别方法的试验系统和方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030082236A1 (en) * 2000-01-14 2003-05-01 Edith Mathiowitz Micronized freeze-dried particles
CN1726870A (zh) * 2004-07-29 2006-02-01 Ge医疗系统环球技术有限公司 X射线ct图像处理方法和x射线ct设备
WO2012028444A2 (fr) * 2010-08-31 2012-03-08 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique et procédé de fabrication correspondant
CN204896266U (zh) * 2015-07-23 2015-12-23 哈尔滨电机厂有限责任公司 组合式冷冻槽
CN115220101A (zh) * 2022-06-21 2022-10-21 中国石油大学(华东) 一种深层碎屑岩砂体沉积结构的建模方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030082236A1 (en) * 2000-01-14 2003-05-01 Edith Mathiowitz Micronized freeze-dried particles
CN1726870A (zh) * 2004-07-29 2006-02-01 Ge医疗系统环球技术有限公司 X射线ct图像处理方法和x射线ct设备
WO2012028444A2 (fr) * 2010-08-31 2012-03-08 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique et procédé de fabrication correspondant
CN204896266U (zh) * 2015-07-23 2015-12-23 哈尔滨电机厂有限责任公司 组合式冷冻槽
CN115220101A (zh) * 2022-06-21 2022-10-21 中国石油大学(华东) 一种深层碎屑岩砂体沉积结构的建模方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118603254A (zh) * 2024-08-08 2024-09-06 同济大学 一种隧道内积水非接触识别方法的试验系统和方法

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